Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums Thank you for visiting RF Cafe!

Data Acquisition System - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


sandeepkor
 Post subject: Data Acquisition System
Posted: Tue Aug 31, 2010 10:01 pm 
 
Lieutenant

Joined: Sun Jul 11, 2010 1:16 pm
Posts: 2
Hey guys,

Not sure if this is the best place to ask this question since this is kind of 'software' related. But since it is for an RF application and you guys might have had experience with it, I am hoping you can help me out.

I am just starting out as a student and as part of my project work, I am supposed to complete a Data Acquisition System for a commercially available digital receiver, all in Linux. I completed the driver development part for the digital receiver. But I am still struggling with the rest - the actual data acquisition program, what do headers mean, what information they convey, how are they supposed to be programmerd, how to build a GUI and a software scope for the data. I have no prior experience in coding for any of these requirements. Kindly help me out - I do not want any direct answers or cookbook recommendations but a general direction in which I should proceed and the concepts I need to learn to eventually be able to complete the task.

Thanks!


 
   
 
karthik
 Post subject: Re: Data Acquisition System
Posted: Wed Sep 01, 2010 11:43 am 
 
Colonel

Joined: Tue Apr 11, 2006 8:13 pm
Posts: 39
Hi Sandeep,

Without knowing much about the application, here are some things that you would want to look at. From your description, it looks like you are building a software interface to communicate with and acquire digitized data from some source.

Here are some things that I would look to do before you start writing code:

1. Write down all the functions you need the software to perform. Once you identify the functions, does there have to be a sequence for these functions, or are they user (or event) driven.

2. Is there a control signal that is used to start/stop acquisition. If so, where does that signal originate - is it a user input or is it from another piece of hardware. If it is hardware, does your code have to control that piece as well.

3. Identify the outputs you need to display. And the source of these outputs. What is the type of display you need for each data type.

Create a flow chart and identify as many pieces of the process as you can. Identify the relationships between different sections if any. That should get you started. Once you have that figured out, then you can look at implementing each block of the flowchart probably as modules and tie them all together, reusing as many blocks as you can.

To answer your question on the header, in a lot (most) of cases, the header section of the data packet consists of information that is needed to parse the rest of the packet. Headers can contain start bits (or characters/sequences of characters) to identify start of a packet, number of bytes being transferred, timestamps, etc. There is no fixed definition for headers, unless your packet structure conforms to a particular protocol. If you are defining your own packet structure, the header is up to you.


Karthik


 
   
 
sandeepkor
 Post subject: Re: Data Acquisition System
Posted: Wed Sep 01, 2010 8:48 pm 
 
Lieutenant

Joined: Sun Jul 11, 2010 1:16 pm
Posts: 2
Thanks Karthik!

That helps! I will get started on that and post updates and if necessary ask further questions!





Posted  11/12/2012

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:
 AirplanesAndRockets.com

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !

height-line